Stanchion base



FIG. 1 is a perspective view of the stanchion base showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a referential perspective view of a microphone stand stanchion mounted on the stanchion base, wherein the broken lines are shown for illustrative purposes and form no part of the claimed design. 

The ornamental design for a stanchion base, as shown and described. 